Conjunctivitis natural history
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Sara Mehrsefat, M.D. [2]
Overview
The outcome is usually good with treatment. Conjunctivitis resolves, in 65% of cases, within 2 – 5 days.[1]
Natural History
If left untreated, most cases of viral conjunctivitis are mild and will clear up in 7 to 14 days without any long-term consequences. if complications arise, viral conjunctivitis can take two or more weeks to resolve. If the conjunctivitis persists, the epithelial abnormalities may occur. In general, the stromal or subepithelial abnormalities may resolved. However, the stromal abnormalities may persist for months to years, long after the epithelial changes have resolved. In such cases, If subepithelial infiltrates are in the pupillary axis, they may lead to decreased vision.
Acute hemorrhagic conjunctivitis is often caused by picornavirus. It presents with a severe red, swollen eyes as well as subconjuntival hemorrhaging, and will clear up in 5 to 7 days. If left untreated, almost always resolves without sequelae.
The incubation period for bacterial conjunctivitis is estimated to be 1 to 7 days. Bacterial conjunctivitis presents with red eye, purulent or mucopurulent discharge, and chemosis. If left untreated, most cases of bacterial conjunctivitis will clear up in 7 to 10 days without any long-term consequences. However, for patients who have purulent or mucopurulent discharge (suspected chlamydial and gonococcal conjunctivitis), who wear contact lenses, and who are immunocompromised, if left untreated, may cause corneal damage (such as corneal ulcer, scar, and perforation), sepsis, and meningitis. This may lead to permanent blindness and death.
Hyperacute bacterial conjunctivitis is often caused by Neisseria gonorrhoeae. It presents with a severe copious purulent discharge, eyelid swelling, eye pain on palpation, preauricular adenopathy, and decreased vision. If left untreated, may cause corneal involvement. this may lead to corneal perforation.
Allergic conjunctivitis usually improves by eliminating or significantly reducing contact with the allergen (pollen or animal dander).
keratoconjunctivitis sicca (dry eye syndrome) presents with a foreign body sensation, mucoid discharge, ocular dryness, excessive tearing (reflex secretion), photophobia, itching, and blurry vision. , symptoms tend to be worse toward the end of the day. If left untreated, with prolonged use of the eyes, or with exposure to extreme environmental conditions, corneal perforation, and corneal ulceration may occur. This may lead to permanent blindness.
Complications
Viral Conjunctivitis
Complications to viral conjunctivitis include:
- Bacterial superinfection
- Keratitis
- Subepithelial infiltrates
- Corneal ulceration with keratoconjunctivitis
- Chronic infection
Bacterial Conjunctivitis
Complications are expected to develop only in cases caused by extremely pathogenic bacteria (such as Chlamydia trachomatis or Neisseria gonorrhoeae). Complications to bacterial conjunctivitis include:
- Sepsis
- Meningitis
- corneal perforation
- keratitis
- Corneal epithelial defects
Neonatal Conjunctivitis
Complications to neonatal conjunctivitis include:
- Ocular complications
- Pseudomembrane formation
- Corneal edema
- Thickened palpebral conjunctiva,
- Peripheral pannus formation
- Corneal opacification
- Staphyloma
- Corneal perforation
- Endophthalmitis
- Loss of eye and blindness
- Systemic complications of chlamydia conjunctivitis
- Pneumonia
- Otitis
- Pharyngeal and rectal colonization
- Systemic complications of gonococcal conjunctivitis
- Arthritis
- Meningitis
- Anorectal infection
- Septicemia
- Death
Allergic Conjunctivitis
Complications to allergic conjunctivitis include:
- Conjunctivochalasis (chronic recurrences)
- Ulceration
- Opacification
- Visual loss
- Steroid induced intraocular pressure elevations
- Cataract
Keratoconjunctivitis Sicca
Complications to keratoconjunctivitis sicca include:
- Corneal ulceration
- Corneal erosions
- Corneal neovascularization
- Corneal scarring
- Corneal thinning
- Corneal perforation
Superior Limbic keratoconjunctivitis
Complications to superior limbic keratoconjunctivitis include:
Prognosis
Acute hemorrhagic conjunctivitis almost always resolves without sequelae, and has a good visual prognosis.
The prognosis of bacterial conjunctivitis is favorable. Prognosis of neonatal conjunctivitis is generally considered to be good as long as early diagnosis is made and prompt medical therapy is initiated. Neonatal conjunctivitis associated with systemic involvement is associated with poorer outcomes, more complicated course and increase mortality.
The prognosis of allergic conjunctivitis is good. However, allergic conjunctivitis subtypes (such as atopic keratovonjunctivitis and vernal keratoconjunctivitis) are associated with worse outcomes.
In general, the prognosis for visual acuity in patients with dry eye syndrome is good. Patients with Sjögren's syndrome or prolonged untreated dry eye are associated with a particularly poor prognosis and requiring a longer course of treatment.
In general, the prognosis for superior limbic keratoconjunctivitis is excellent, with remission as the natural history and eventual total resolution, although symptoms may last for years.